Shaker scoop

[1] However, because engines draw air in hundreds of cubic feet per minute, scoops do not raise intake pressures significantly.

[2] Additional claimed benefits of a shaker hood include elevation to prevent water from being drawn on flooded terrain, being a source of cooler, denser air, and having a more direct path to the engine's throttle plate.

Some aftermarket scoops include butterfly valves, which act as secondary throttle bodies.

[3] Larry Shinoda of Ford is credited with introducing the shaker hood scoop as a factory-fitted option and campaigning to make it functional, first available exclusively for the 1969 model year Mustang equipped with the 428 Cobra Jet engine;[4] the option was expanded to other Ford Mustang engines for 1970 and imitated quickly by competitors Chrysler (1970 Plymouth 'cuda and Dodge Challenger) and Pontiac (19701⁄2 Firebird Trans Am, which used a backwards-facing scoop to draw air from the high-pressure area at the base of the windshield).

[5] Some official Chrysler literature referred to this popular hood style as the "Incredible Quivering Exposed Cold Air Grabber".